magma chamber-a place where magma collects into a pocket pipe-a long tube where magma flows to the surface from the magma chamber vent-a place on the volcano where magma pours out of lava flow-a area covered by lava as it pours out of the vent crater-a bowl shaped area that may form at the top of the volcano at the top of the central vent Silica-made from the element silicon and oxygen pahoehoe-a hot, fast moving lava aa-a cooler, slow moving lava pyroclastic flow-occurs when explosive eruption trows ash, cinders, bombs, and maybe even gases active-a live volcano is erupting and may erupt in the future dormant-a sleeping volcano that is "sleeping" and may erupt in the future extinct-a volcano that is no longer active hot spring-a area where groundwater as been heated and rises to the surface forming a natural pool geyser-a fountian of water that erupts from the ground geothermal energy-how energy can be made using magma heated water from hot springs
Outline
Volcanic activity
How magma reaches the surface
Magma rises
magma is less dense that rock so it moves up
A volcano erupts
During an eruption, the dissolved gases rush out carrying magma with them
Inside a volcano
a volcano always has a pocket beneath them filled with molten material
Characteristics of magma
Types of volcanic eruptions
quiet eruptions
a volcano erupts smoothly during quiet eruptions
there two types of magma that produce quiet eruptions
Explosive eruptions
explosive eruptions erupts wildly with bottled up gas and huge rocks
Stages of a volcano
active
active volcanos are volcanos that continue to erupt
dormant
dormant volcanos are volcano that are "sleeping" which mean that they havent erupt in a long time
extinct
extinct volcanos no longer erupt
Other types of volcanic activity
volcanos might make other things that dont involve lava
Table of Contents
3.2 Volcanic Activity
Vocabulary
magma chamber-a place where magma collects into a pocket
pipe-a long tube where magma flows to the surface from the magma chamber
vent-a place on the volcano where magma pours out of
lava flow-a area covered by lava as it pours out of the vent
crater-a bowl shaped area that may form at the top of the volcano at the top of the central vent
Silica-made from the element silicon and oxygen
pahoehoe-a hot, fast moving lava
aa-a cooler, slow moving lava
pyroclastic flow-occurs when explosive eruption trows ash, cinders, bombs, and maybe even gases
active-a live volcano is erupting and may erupt in the future
dormant-a sleeping volcano that is "sleeping" and may erupt in the future
extinct-a volcano that is no longer active
hot spring-a area where groundwater as been heated and rises to the surface forming a natural pool
geyser-a fountian of water that erupts from the ground
geothermal energy-how energy can be made using magma heated water from hot springs
Outline
Volcanic activity